Science Practice Quiz 83

Q1.What happens to a light ray when it enters from a denser medium to a rarer medium, for example, from glass to air?

A. It bends towards the normal. B. It bends away from the normal. C. It travels along the normal. D. It gets absorbed by the medium.

Q2.What is the primary reason for the phenomenon of refraction of light?

A. Change in the color of light. B. Change in the speed of light. C. Change in the intensity of light. D. Change in the frequency of light.

Q3.In the context of light passing through a rectangular glass slab, why is the emergent ray parallel to the direction of the incident ray?

A. The angle of incidence is always zero. B. The glass slab absorbs all light. C. The bending at opposite parallel faces is equal and opposite. D. The light ray travels at infinite speed inside the slab.

Q4.When a light ray emerges parallel to the incident ray after passing through a rectangular glass slab, what other observation is made regarding its path?

A. The light ray is shifted sidewar d slightly. B. The light ray changes its color. C. The light ray becomes dimmer. D. The light ray travels faster.

Q5.In the diagram illustrating refraction through a rectangular glass slab (Fig. 9.10), what is the ray OO′ referred to as?

A. The incident ray. B. The emergent ray. C. The refracted ray. D. The reflected ray.

Q6.Where do the points O and O′, where the light ray changes direction, lie in the context of refraction?

A. On the surface of the denser medium only. B. On the surface of the rarer medium only. C. On surfaces separating two transparent media. D. Inside the transparent media.

Q7.What is the fundamental observation made about a light ray at points O and O′ during the activity described?

A. The light ray changes its color. B. The light ray changes its direction. C. The light ray changes its intensity. D. The light ray changes its speed to zero.

Q8.Activity 9.10, which involves a rectangular glass slab and pins, is designed to demonstrate which phenomenon?

A. Reflection of light. B. Dispersion of light. C. Refraction of light through a rectangular glass slab. D. Total internal reflection.

Q9.In the context of light incident on a surface, what is a ray obliquely incident on surface AB, such as EO, called?

A. The emergent ray. B. The refracted ray. C. The incident ray. D. The normal ray.

Q10.Which of the following statements correctly describes the first law of refraction of light?

A. The incident ray, the refracted ray, and the normal to the interface at the point of incidence all lie in the same plane. B. The incident ray, the reflected ray, and the normal to the surface all lie in the same plane. C. The angle of incidence is always equal to the angle of refraction. D. Light always bends towards the normal when passing from one medium to another.

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Science Practice Quiz 83